The agency has been probing Ivanka's involvement with the Trump International Hotel and Tower in Vancouver, Canada — specifically looking into the negotiations and financing of the deal. Because of the complex nature of many of the Trump Organization's business deals, the investigation can be challenging.

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Like her husband Jared Kushner, who recently saw his temporary security clearance downgraded, Ivanka was been involved in several international business arrangements before joining the White House last year. Many of other Trump properties have attracted foreign buyers — and the Vancouver development was no exception, CNN reported. What the FBI is trying to determine is whether her dealings and overseas contacts could leave her exposed to pressure from foreign agents.

It's unclear why investigators are focusing specifically on the Vancouver development. Like many other of the Trumps' projects, the family's organization doesn't own the building. Instead, the hotel, which opened in February 2017, receives licensing and marketing fees from the Canada-based development company Holborn Group and the real estate executive at the helm of the company, Joo Kim Tiah.

CNN reported Ivanka was the main contact from the Trump Organization in the development of the project. She worked close to Tiah, to the point that in 2015 he said the first daughter helped him approve "everything in the project." (There's even a trademarked Ivanka Trump spa on the property.)

The Trump Organization made over $5 million in royalties from the Vancouver hotel, according to the financial disclosure released by President Trump last June. It also obtained about $21,500 in management fees.